Make sure there is also a TOC in the HTML export

.dir-locals.el

@@ -15,4 +15,5 @@
                               ("\\subsubsection{%s}" . "\\subsubsection*{%s}"))))
          (org-latex-src-block-backend . 'listings)
          (org-latex-prefer-user-labels . t)
+         (org-latex-toc-command . "\\frontmatter\n\\addchap{Table of Contents}\n\\listoftoc*{toc}\n\n")
          (fill-column . 200))))

book.org

@@ -18,21 +18,14 @@
 #+LATEX_HEADER: Prof.\ Dr.\ Ir.\ Bart Mesuere\\
 #+LATEX_HEADER: Prof.\ Dr.\ Bram De Wever
 #+LATEX_HEADER: }
-#+OPTIONS: toc:nil
 #+OPTIONS: ':t
 #+OPTIONS: H:4
 #+cite_export: csl citation-style.csl
 #+bibliography: bibliography.bib
 
-#+LATEX: \frontmatter
-
-* Table of Contents
-:PROPERTIES:
-:CREATED:  [2023-10-23 Mon 14:10]
-:CUSTOM_ID: chap:toc
-:UNNUMBERED: t
-:END:
-#+LATEX: \listoftoc*{toc}
+#+BEGIN_COMMENT
+There should be a `#+LATEX: \frontmatter` here, but if I want to still be able to export to HTML, have the TOC show up in itself, change its heading and have the TOC be part of the front matter, the `\frontmatter` statement needs to be part of the `org-latex-toc-command`.
+#+END_COMMENT
 
 * Acknowledgements
 :PROPERTIES:

build.el

@@ -14,7 +14,8 @@
                            ("\\subsection{%s}" . "\\subsection*{%s}")
                            ("\\subsubsection{%s}" . "\\subsubsection*{%s}")))
       org-latex-src-block-backend 'listings
-      org-latex-prefer-user-labels t)
+      org-latex-prefer-user-labels t
+      org-latex-toc-command "\\frontmatter\n\\addchap{Table of Contents}\n\\listoftoc*{toc}\n\n")
 
 (find-file "book.org")
 (org-latex-export-to-latex)